Which of the following species exhibits the diamagnetic behaviour?

Options

A. NO
B. `O_2^(2-)`
C. `O_2^(+)`
D. `O_2`

Answer

B

Explanation

The electronic configuration is, `O_2^(2-)= sigma1s^2" "sigma^("*")2s^2" "sigma2s" "sigma^("*")2s^2" "sigma2p_z^2" "pi 2p_z^2" "pi2p_x^2=pi2p_y^2 pi^("*")2p_x^2=pi^("*")2p_y^2`
There is no unpaired electron, so it is diamagnetic.